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J. Biol. Chem., Vol. 277, Issue 13, 11297-11305, March 29, 2002
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,
From the Institut für Biochemie, Universitätsklinikum
der Rheinisch-Westfälischen Technischen Hochschule Aachen,
Pauwelsstr. 30, 52074 Aachen, Germany and The oncostatin M receptor (OSMR) is part of a
heterodimeric receptor complex that mediates signal transduction of the
pleiotropic cytokine OSM via a signaling pathway involving Janus
kinases (Jaks) and transcription factors of the signal transducers and
activators of transcription (STAT) family. Upon heterologous expression
of the OSMR in several cell lines, we observed that its surface
expression was significantly enhanced by coexpression of the Janus
kinases Jak1, Jak2, and Tyk2 but not Jak3. Chimeric receptors
consisting of the extracellular region of the interleukin-5
receptor
INSERM E 9928, Centre hospitalier universitaire Angers, Batiment Monteclair, 4 Rue
Larrey, 49033 Angers, France
chain and the transmembrane and intracellular part of the
OSMR were similarly up-regulated on the plasma membrane when Jak1 was
coexpressed. The overall expression level of these constructs did not
change significantly, but Jak1 coexpression increased the amount of
endoglycosidase H-resistant, fully processed OSMR chimeras.
Using mutated receptor and Jak1 constructs, we were able to demonstrate
that association of Jak1 with the membrane proximal region of the
receptor, but not its kinase activity, is necessary for this effect.
Moreover, deletion of the OSMR box1/2 region also resulted in an
improved surface expression indicating that this region may contain a
signal preventing efficient receptor surface expression in the absence of associated Jaks. Finally we demonstrate that in Jak1-deficient cells, the endogenous OSMR is significantly down-regulated, an effect
that can be reversed by transient expression of Jak1 in these cells.
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